<?php

class ArticleController extends Controller
{
	/**
	 * @var string the default layout for the views. Defaults to '//layouts/column2', meaning
	 * using two-column layout. See 'protected/views/layouts/column2.php'.
	 */
	public $layout='column2';

	/**
	 * @return array action filters
	 */
	public function filters()
	{
		return array(
			'accessControl', // perform access control for CRUD operations
		);
	}

	/**
	 * Specifies the access control rules.
	 * This method is used by the 'accessControl' filter.
	 * @return array access control rules
	 */
	public function accessRules()
	{
            return array(
                array('allow',  // allow all users to perform 'index' and 'view' actions
                        'actions'=>array('index','view'),
                        'users'=>array('*'),
                ),
                array('allow', // allow authenticated user to perform 'create' and 'update' actions
                        'actions'=>array('create','update'),
                        'users'=>array('@'),
                ),
                array('allow', // allow admin user to perform 'admin' and 'delete' actions
                        'actions'=>array('admin','delete'),
                        'users'=>array('admin'),
                ),
                array('deny',  // deny all users
                        'users'=>array('*'),
                ),
            );
	}

	/**
	 * Displays a particular model.
	 * @param integer $id the ID of the model to be displayed
	 */
	public function actionView($id)
	{
            $this->render('view',array(
                    'model'=>$this->loadModel($id),
            ));
	}

	/**
	 * Creates a new model.
	 * If creation is successful, the browser will be redirected to the 'view' page.
	 */
	public function actionCreate()
	{
            $model=new Article;
            
            // Uncomment the following line if AJAX validation is needed
            // $this->performAjaxValidation($model);

            if(isset($_POST['Article']))
            {
                $model->attributes=$_POST['Article'];
                if($model->save()){
                        // upload files
                        // update upload and upload_article tables
                        $this->createFiles($model->id);
                        
                        $this->redirect(array('view','id'=>$model->id));
                }
            }

            $this->render('create',array(
                    'model'=>$model,
            ));
	}

	/**
	 * Updates a particular model.
	 * If update is successful, the browser will be redirected to the 'view' page.
	 * @param integer $id the ID of the model to be updated
	 */
	public function actionUpdate($id)
	{
		$model=$this->loadModel($id);

		// Uncomment the following line if AJAX validation is needed
		// $this->performAjaxValidation($model);

		if(isset($_POST['Article']))
		{
                    // uploaded files
                    $this->createFiles($id);
                    
                    $model->attributes=$_POST['Article'];
                    if($model->save())
                            $this->redirect(array('view','id'=>$model->id));
		}

		$this->render('update',array(
			'model'=>$model,
		));
	}

	/**
	 * Deletes a particular model.
	 * If deletion is successful, the browser will be redirected to the 'admin' page.
	 * @param integer $id the ID of the model to be deleted
	 */
	public function actionDelete($id)
	{
		if(Yii::app()->request->isPostRequest)
		{
                    // delete column from upload and upload_article tables
                    $this->deleteFiles($id);
                    // we only allow deletion via POST request
                    $this->loadModel($id)->delete();

                    // if AJAX request (triggered by deletion via admin grid view), we should not redirect the browser
                    if(!isset($_GET['ajax']))
                            $this->redirect(isset($_POST['returnUrl']) ? $_POST['returnUrl'] : array('admin'));
                }
                else
                    throw new CHttpException(400,'Invalid request. Please do not repeat this request again.');
	}

	/**
	 * Lists all models.
	 */
	public function actionIndex()
	{
		$dataProvider=new CActiveDataProvider('Article');
		$this->render('index',array(
			'dataProvider'=>$dataProvider,
		));
	}

	/**
	 * Manages all models.
	 */
	public function actionAdmin()
	{
		$model=new Article('search');
		$model->unsetAttributes();  // clear any default values
		if(isset($_GET['Article']))
			$model->attributes=$_GET['Article'];

		$this->render('admin',array(
			'model'=>$model,
		));
	}

	/**
	 * Returns the data model based on the primary key given in the GET variable.
	 * If the data model is not found, an HTTP exception will be raised.
	 * @param integer the ID of the model to be loaded
	 */
	public function loadModel($id)
	{
		$model=Article::model()->findByPk($id);
		if($model===null)
			throw new CHttpException(404,'The requested page does not exist.');
		return $model;
	}

	/**
	 * Performs the AJAX validation.
	 * @param CModel the model to be validated
	 */
	protected function performAjaxValidation($model)
	{
		if(isset($_POST['ajax']) && $_POST['ajax']==='article-form')
		{
			echo CActiveForm::validate($model);
			Yii::app()->end();
		}
	}
        
        public function createFiles($id)
        {     
            // handle uploaded files
            $uploads = CUploadedFile::getInstancesByName('uploads');
            if($uploads !== NULL){
                foreach($uploads as $upload=>$file){
                    // upload model
                    $model = new Upload;
                    $ext = explode('.',$file->name);
                    $name = $model->encrypt();
                    // upload file
                    if($file->saveAs(Yii::getPathOfAlias('uploads').'/'.$name.'.'.$ext[1])){
                        // save upload table
                        $model->title = $ext[0];
                        $model->name = $name;
                        $model->ext = $ext[1];
                        $model->type = $file->type;
                        $model->size = $file->size;
                        if($model->save()){
                            $uamodel = new UploadArticle;
                            $uamodel->uploadid = $model->id;
                            $uamodel->articleid = $id;
                            $uamodel->save();
                        }
                    }
                    else{
                        throw new CHttpException(403, 'Upload files failed.');
                    }
                }
            }
        }
        
        public function deleteFiles($id)
        {
            $model = Upload::model()->with(array(
                'uploadArticles'=>array(
                    'select'=>false,
                    'joinType'=>'INNER JOIN',
                    //'condition'=>'uploadArticles.articleid = '.$id,
                    'condition'=>'uploadArticles_uploadArticles.articleid = '.$id,
                )
            ))->findAll();
            
            // delete local files
            foreach($model as $key=>$value){
                if(unlink(Yii::getPathOfAlias('uploads').'/'.$value->name.'.'.$value->ext)){
                    // delete column in upload table
                    $model = new Upload;
                    $model->deleteByPk($value->id);
                }                
            }
        }
}
